Episode show notes do not respect system font

### Description

If a user has a custom system font enabled, the episode show notes do not use that font.

Relevant [SO question](https://stackoverflow.com/questions/26635640/access-androids-system-fonts-in-webview)

### Step-by-step reproduction instructions

1. Turn on a noticeably unusual custom font on your device
2. Open up the episode details screen to view an episodes show notes
3. Observe that the rest of the app is using the unusual custom font, but the show notes are not using that font.

### Screenshots or screen recording

### Did you search for existing bug reports?

- [X] I have searched for existing bug reports.

### Device, Operating system, and Pocket Casts app version

Samsung A13, Android 12, Pocket Casts 7.27 (9053)

Start by reproducing the issue on Android 12 with a custom system font, then locate the episode details screen and its show-notes rendering. Done means the show notes use the device's custom font consistently with the rest of the app; no specific source file or test is named in the issue.

Written by the indexing model from the issue text.